<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>demo2-3</title>
    <script src="vue.js"></script>
</head>
<body>
    <div id="app">
        我是div标签
    </div>
</body>
<script>
    const comApp = {
        template:"<h1>hello,I am template!</h1>",
    };
    Vue.createApp(comApp).mount("#app");
</script>
</html>